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绿色植物新陈代谢作用是较复杂的。如何在教学中直观地演示给学生看呢,在同志们帮下制出一件电光活动模型,可表示水的吸收,水的蒸腾,光合作用,呼吸作用,有机物的运输和貯藏等内容。其制法如下:一、截取50×80厘米之三合板一块,四周钉上木框和钉好底座。画上图形底稿。将要控空处用红笔画出。二、用搜弓子锯去要挖空的部分。三、将挖空处从背面糊上两层玻璃纸。
The metabolism of green plants is more complicated. How to visually demonstrate to the students in teaching how to make a model of electro-optic activity with the help of comrades, which can mean water absorption, water transpiration, photosynthesis, respiration, transportation and storage of organic matter and so on. The system of law is as follows: First, intercept 50 × 80 cm of a plywood, nailed around the wooden frame and nail a good base. Draw a graphic artwork. Will be controlled by a red pen drawing space. Second, use a search bow saw to hollow out the part. Third, the hollowing place from the back paste two layers of cellophane.